Synchronism-indicator.



V. A. WOLGOTT.

SYNOHRONISM INDICATOR. I

APPLICATION FILED SEPT. 9, 1911.

1,09 1,722. Patented Mar. 31, I914.

Witnesses: m Inventor:

. Varanus JI. Wolcott, q W Qwfi His JTttorneg.

'* UNITED STATES PATENT OFFICE.

i vmnus A. woncorr, or BUTTE, MONTANA, AssIsNon 'ro GENERAL ELECTRIC V 1 I compan A CORPORATION or NEW YORK- SYNCHRONISM-INDICATOR.

. Specification 01' Letters Patent. Application filed September 9, 1911. Serial No. 648,577;

Patented Mar.- 31, 1914.

To all whom it may concern:

Be it known thatI, VARANUS A. WoL- G011, a citizen of the United States, res1d-- ing at Butte, in the county of Silverbow,

tions therefor which are particularly adapted to locations'where it is desired to syn- 1 chronize transmission lines but where there are no step-down transformers available for supplying low voltage to a synchronism I indicator of the ordinary type.

In the majority of locations where it is desired to synchronize high tenslon transmission lines there are step-down transformers, to the secondaries of which a synchronism indicator of the ordinary type may be connected, butthere are many cases which arise where no such transformers are available. It then becomes necessary if synchronism indicators of the ordinary type are to be used, to provide special step-down transformers, and, if the voltage of transmission lines is high, these small transformers become very expensive. By my invention it is possible to dispense entirely with costly step-down transformers in such cases. I ob-' tain' this result by providing an electrostatically actuated synchronism indicator, similar in construction to, an ordinary electrostatic voltmeter, and connections for impressing on the indicator electrostatic voltages proportional to, but less than, the instantaneous values of the electrostatic voltage between the respective line conductors and ground. Since almost all high tension transmission lines to-day are supported by a suspension type of insulator, each support comprising a series of these insulators, the connections for'impressing the desired voltage on the synchronismindicator may be 'readily and simply obtained by connecting"- tho. indicator leads to points between the first and" second insulator from ground of a series of insulators for each conductor.

My invention will best be understood by reference to the accompanying drawing which shows diagrammatically asynchronism indicator arranged in accordance with my invention. p r

In the drawing, A and A represent high tension conductors constituting one phase of an alternating current transmission system.

B represents a'switch for'connecting the two conductors together when the voltages thereon are in synchronism.

Each conductor is supported by a series of suspension insulators C, which are megillanically connected by short pieces of eac 0. Y I), D represent cross arms on the towers carrying the transmission lines.

E representsan electrostatically actuated indicating instrument which may be constructed like any of the types-of electrostatic voltmeters heretofore known in the art and which is indicated'diagrammatically as comprising a stationary vane, a movable vane, and a needle or pointer carried by the movable vane and moving over a suitable scale. The stationary and movable vanes respectively are connected to points between the first and secondinsulators from ground of the series of insulators supporting the two conductors A'and A respectively. These indicator leads therefore receive from the conductors A and A, by electrostatic induction, and impress on, the indicator, voltages equal to definite fractions of the electrostatic voltages between said conductors and ground, that is, voltages proportional to, but

not in synchronism, an electrostatic voltage exists between the two vanes and the needle moves over the scale. Thus the device indicates accurately the condition of synchronism, and, if the voltages are-outof stands in zero position. If the voltages are synchronism, this needle vibrates with a frequency corresponding to the amount by which the voltages are out of synchronism.

I do not desire to limit myself to the particular construction and arrangement of parts shown and described but aim in the appended claims to cover all modifications which are within the spirit and scope of my invention.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In combination with a plurality of high tension alternating current conductors, insulating supports therefor, a switch for conmeeting said conductors together, and a synchronism indicator comprising an electrostatically actuated indicator electrically connected between said insulating supports, the points of connection of said indicator to said insulating supports being between the ends or said insulating supports.

2. In combination with a plurality of high tension alternating current conductors, supstatically actuated indicator connected between corresponding points on said supports.

3. In combination with a plurality of high tension alternating current conductors, supports therefor each comprising a plurality of insulators in series, a switch for connecting said conductors together, and a synchronisrn indicator comprising an electrostatically actuated indicator. connected to points between the first and second insulators from ground of each of said series.

In Witness whereof, I have hereunto set my hand this first day of September, 1911.

VARANUS A. WOLCOTT. 

